Method and Apparatus for Transmitting Frame in Wireless LAN

1. A method used in a wireless Local Area Network (LAN), comprising: receiving, by a first station (STA) from an access point (AP), a single request to send (RTS) frame triggering transmission of multiple clear to send (CTS) frames from multiple STAs on an overlapping frequency band including a 20 MHz band during a same time period; in response to the single RTS frame, transmitting, by the first STA to the AP, a first CTS frame on the overlapping frequency band during the same time period; and receiving, by the first STA from the AP, a downlink physical layer protocol data unit (PPDU) based on the overlapping frequency band.

2. The method of claim 1 , wherein a second CTS frame is transmitted by a second STA to the AP in response to the single RTS frame.

3. The method of claim 2 , wherein the second CTS frame is transmitted to the AP on the overlapping frequency band during the same time period.

4. The method of claim 1 , wherein the single RTS frame comprises a medium access control (MAC) header including an address field related to the multiple STAs.

5. The method of claim 4 , wherein the MAC header further includes a duration field which is used for setting a network allocation vector (NAV) of an unintended receiver of the single RTS frame.

6. The method of claim 1 , wherein the downlink PPDU includes user data for the multiple STAs.

7. A station (STA) in a wireless Local Area Network (LAN), comprising: a transceiver transmitting or receiving radio signals; and a processor connected to the transceiver and configured to: instruct the transceiver to receive, from an access point (AP), a single request to send (RTS) frame triggering transmission of multiple clear to send (CTS) frames from multiple STAs on an overlapping frequency band including a 20 MHz band during a same time period; in response to the single RTS frame, instruct the transceiver to transmit, to the AP, a first CTS frame on the overlapping frequency band during the same time period; and instruct the transceiver to receive, from the AP, a downlink physical layer protocol data unit (PPDU) based on the overlapping frequency band.

8. The station of claim 7 , wherein a second CTS frame is transmitted by another STA to the AP in response to the single RTS frame.

9. The station of claim 8 , wherein the second CTS frame is transmitted to the AP on the overlapping frequency band during the same time period.

10. The station of claim 7 , wherein the single RTS frame comprises a medium access control (MAC) header including an address field related to the multiple STAs.

11. The station of claim 10 , wherein the MAC header further includes a duration field which is used for setting a network allocation vector (NAV) of an unintended receiver of the single RTS frame.

12. The station of claim 7 , wherein the downlink PPDU includes user data for the multiple STAs.